Sorry, there was a bug introduced in 2.7.1 that I'll release 2.7.2 to fix today (Thanks to the guys at Akamai for finding and patching it). The security enhancements accidentally blocked one form of the videos from getting through.

You can do a spot fix by grabbing common.inc from SVN, that and an update to .htaccess (rewrite rule for the new timeline view wasn't quite right) are the only changes going in to 2.7.2